// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#ifndef ABSTRACTITEMVIEW_H
#define ABSTRACTITEMVIEW_H

#include <QAbstractItemModel>
#include <QGraphicsSceneResizeEvent>
#include <QPersistentModelIndex>
#include <QItemSelection>

#include "listitemcontainer.h"
#include "abstractscrollarea.h"
#include "scroller.h"

class QItemSelectionModel;

class AbstractItemView : public AbstractScrollArea
{
    Q_OBJECT
public:
    AbstractItemView(QGraphicsWidget *parent = nullptr);
    virtual ~AbstractItemView();
    virtual void setContainer(AbstractItemContainer *container);
    virtual void setModel(QAbstractItemModel *model, AbstractViewItem *prototype);
    virtual QAbstractItemModel* model() const;
    virtual void setItemPrototype(AbstractViewItem* prototype);

    void setSelectionModel(QItemSelectionModel *smodel);

    virtual QModelIndex nextIndex(const QModelIndex &index) const;
    virtual QModelIndex previousIndex(const QModelIndex &index) const;

    virtual int indexCount() const;

    void refreshContainerGeometry(); // TODO Can this be moved to scroll area?

    void updateViewContent();
    virtual void scrollContentsBy(qreal dx, qreal dy);

    virtual bool listItemCaching() const = 0;
    virtual void setListItemCaching(bool enabled) = 0;

protected:
    virtual bool event(QEvent *e);
    void changeTheme();

public slots:
    virtual void setRootIndex(const QModelIndex &index);
    void setCurrentIndex(const QModelIndex &index,
                         QItemSelectionModel::SelectionFlags selectionFlag = QItemSelectionModel::NoUpdate);
protected slots:
    virtual void currentIndexChanged(const QModelIndex &current, const QModelIndex &previous);
    virtual void currentSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected);
    virtual void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight);
    virtual void rowsAboutToBeInserted(const QModelIndex &index, int start, int end);
    virtual void rowsInserted(const QModelIndex &parent, int start, int end);
    virtual void rowsAboutToBeRemoved(const QModelIndex &index,int start, int end);
    virtual void rowsRemoved(const QModelIndex &parent,int start, int end);
    virtual void modelDestroyed();
    virtual void layoutChanged();
    virtual void reset();

protected:

    QAbstractItemModel *m_model;
    QPersistentModelIndex m_rootIndex;
    AbstractItemContainer *m_container;
    QItemSelectionModel *m_selectionModel;
    QPersistentModelIndex m_currentIndex;

private:
    Q_DISABLE_COPY(AbstractItemView)
    Scroller m_scroller;
};


#endif // ABSTRACTITEMVIEW_H